Whichever fantasy football owners had Chris Johnson in their lineup were going absolutely nuts yesterday when he ran for 195 yards and not only found the end zone for the first time this season, but actually recorded two touchdown runs.

I know fantasy football owners think this is a sign of Johnson breaking out of his funk, but let's not get ahead of ourselves. Sure, Johnson showed us that he can still put up big numbers, but do not expect him to do this on a consistent basis.

Here are three reasons why you should only expect Johnson to be a low end No. 2 fantasy running back or FLEX position at best for the rest of the 2012 NFL season.

The Non-Existent Buffalo Bills Run Defense

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Chris Johnson's 195 rushing yard performance yesterday made fantasy football owners have flashbacks of his 2009 season when he rushed for over 2000 yards.

Before we start making Johnson a No. 1 fantasy back again, we have to realize that the Tennessee Titans were going up against the Buffalo Bills. The Bills run defense is by far the worst in the NFL this year, allowing over 176 rushing yards per game. Not once this season have the Bills held an opposing offense to less than 100 rushing yards.

When you go up against the worst run defense in the league, it should not be a surprise to any fantasy football owner that Johnson had his best game since last season.

Inconsistent Play

Three weeks ago, Chris Johnson ran for over 140 yards and everyone thought that "CJ2K" was finally back. In his next game, Johnson ran for only 24 yards.

This has been the story for Johnson the last two seasons.

Last year, he only ran for over 100 yards four times. After his game yesterday, Johnson has still only ran for over 100 yards twice this season. In fact, Johnson has not posted consecutive 100 rushing yard performances since last season when he only did it once. Despite that one time, over the last two seasons, whenever Johnson has ran for over 100 yards, he has never gone on to run for more than 51 yards in his following game.

Johnson has not shown he can be reliable on a weekly basis. For every game that Johnson could single-handedly carry your fantasy football team, he also has the potential to ruin it. Any running back who cannot consistently put up solid fantasy numbers cannot be considered a No. 1 fantasy back.

Defenses love going up against these quarterbacks and dare them to try and throw the ball. With no legit quarterback, defenses are going to be able to continue to stack the box against Johnson and will have no problem shutting him down.